The World's Smallest Phone Charger:
Chargerito is a tiny mobile device charger that plugs into your wall. It fits easily in any pocket, so you always have a charger on hand. Chargerito is not another battery pack you have to charge separately or a USB charger that has to plug into another device to charge.

Pour le moment, les prises sont destinées uniquement aux US (et autres prises anglaises), des versions pour le monde vont voir le jour.

-- Source: https://www.chargerito.com/